Unable to provide all requested tracks ?

je travaille sur ce code alors a chaque execution apparaisse cette erreur sans résultat
:(:(:(

Code:

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    javax.media.CannotRealizeException: Unable to provide all requested tracks
Exception in thread "main" java.lang.NullPointerException
        at Test_Capture_VideoSound.main(Test_Capture_VideoSound.java:105)

:(
le code est le suivant

Code:

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    import java.io.IOException;
    import java.util.Vector;
    import javax.media.CannotRealizeException;
    import javax.media.CaptureDeviceInfo;
    import javax.media.CaptureDeviceManager;
    import javax.media.DataSink;
    import javax.media.Format;
    import javax.media.IncompatibleSourceException;
    import javax.media.Manager;
    import javax.media.MediaLocator;
    import javax.media.NoDataSinkException;
    import javax.media.NoDataSourceException;
    import javax.media.NoProcessorException;
    import javax.media.Processor;
    import javax.media.ProcessorModel;
    import javax.media.format.AudioFormat;
    import javax.media.format.VideoFormat;
    import javax.media.protocol.DataSource;
    import javax.media.protocol.FileTypeDescriptor;
 
    public class Test_Capture_VideoSound {
 
      static CaptureDeviceInfo  videoDevice = null;
      static VideoFormat        videoFormat = null;
 
      static CaptureDeviceInfo  audioDevice = null;
      static AudioFormat        audioFormat = null;
 
      public static void main(String args[]) throws NoDataSourceException, IOException, IncompatibleSourceException, NoProcessorException, CannotRealizeException, NoDataSinkException  {
 
        //GET ALL MEDIA DEVICES.
        Vector deviceListVector = CaptureDeviceManager.getDeviceList(null);
 
        //CHOOSE AUDIO & VIDEO DEVICES & FORMATS.
        for (int x = 0; x < deviceListVector.size(); x++)    {
 
          CaptureDeviceInfo device         = (CaptureDeviceInfo) deviceListVector.elementAt(x);
          String            deviceName     = device.getName();
          Format            deviceFormat[] = device.getFormats();
 
          for (int y = 0; y < deviceFormat.length; y++)      {
 
            if (videoDevice == null && deviceFormat[y] instanceof VideoFormat) {
              videoDevice = device;
              videoFormat = (VideoFormat) deviceFormat[y];
            }
 
            if (audioDevice == null && deviceFormat[y] instanceof AudioFormat) {
              audioDevice = device;
              audioFormat = (AudioFormat) deviceFormat[y];
            }
 
          }
        }
 
        //CREATE DATA SOURCE.--------------------------------
 
        //SETUP VIDEO SOURCE & FORMAT.
        DataSource videoDataSource = Manager.createDataSource(videoDevice.getLocator());
 
        DeviceInfo.setFormat(videoDataSource, videoFormat);
 
        //SETUP AUDIO SOURCE & FORMAT.
        DataSource audioDataSource = Manager.createDataSource(audioDevice.getLocator());
        DeviceInfo.setFormat(audioDataSource, audioFormat);
 
        //MERGE VIDEO & AUDIO SOURCES.
        DataSource  dArray[]        = new DataSource[2];
                    dArray[0]       = videoDataSource;
                    dArray[1]       = audioDataSource;
        DataSource  mixedDataSource = Manager.createMergingDataSource(dArray);
 
        //CREATE PROCESSOR.--------------------------------
 
        //DEFINE OUTPUT FORMAT.
        Format  outputFormat[]  = new Format[2];
                outputFormat[0] = new VideoFormat(VideoFormat.INDEO50);
                outputFormat[1] = new AudioFormat(AudioFormat.GSM_MS /* LINEAR */);
 
        //DEFINE OUTPUT FILE FORMAT.
        FileTypeDescriptor outputType = new FileTypeDescriptor(FileTypeDescriptor.MSVIDEO);
 
        //CRATE PROCESSOR.
 
          ProcessorModel processorModel;
 
        Processor      processor = null ;
    try
    {         processorModel = new ProcessorModel(mixedDataSource, outputFormat, outputType);
 
             processor      = Manager.createRealizedProcessor(processorModel);
      }
      catch(Exception e)    { System.out.println ("Erreur: "+ e);
            }
        //CREATE DATA SINK TO FILE.----------------------
        DataSource          source            = processor.getDataOutput();
        MediaLocator        dest              = new MediaLocator("file:testcam.avi");
        MyDataSinkListener  dataSinkListener  = new MyDataSinkListener();
        DataSink            dataSink          = Manager.createDataSink(source, dest);
                            dataSink.addDataSinkListener(dataSinkListener);
                            dataSink.open();
 
        //START DATA SINK AND PROCESSOR.
        dataSink.start();
        processor.start();
 
        Stdout.log("starting capturing ...");
        try { Thread.sleep(10000); } catch (InterruptedException ie) {} // capture for 10 seconds
        Stdout.log("... capturing done");
 
        //CLOSE PROCESSOR.
        processor.stop();
        processor.close();
 
        //CLOSE DATA SINK.
        dataSinkListener.waitEndOfStream(10);
        dataSink.close();
 
      }
 
    }

SVP qui peut m"aidé :(